Is it possible to override the ABSPATH constant

The official reply is that ABSPATH is more for backward compatibility with code which was written when plugins were including wp-config.php and overriding WP_CONTENT_DIR should be enough.

https://core.trac.wordpress.org/ticket/29626#comment:3

https://core.trac.wordpress.org/ticket/26592#comment:8

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)